The += operator

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Tue Dec 01 2020 08:50:38 GMT+0000 (Coordinated Universal Time)

<!DOCTYPE html>
<html>
<body>

<h2>The += Operator</h2>

<p id="demo"></p>

<script>
var x = 10;
x += 5;
document.getElementById("demo").innerHTML = x;
</script>

</body>
</html>

COPY

https://www.w3schools.com/js/tryit.asp?filename

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The += operator

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